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A Quality Control Engineer Wants to Determine What Is the Proportion

Question 163

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A quality control engineer wants to determine what is the proportion of defective parts coming off the assembly line. Past experiments, based on large sample sizes, have shown this proportion to be 0.19. What sample size does the engineer need in order to estimate, with 90% confidence, this proportion with a margin of error of 0.12? Justify your conclusion.

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blured image (0.19)(0.81) blured image = 28....

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